This is the O.S. GT60 Gasoline Large Scale Airplane Engine
with Pitts Style E-6020 Muffler.

FEATURES

Linerless cylinder with the cylinder head integrated with the
cylinder, this arrangement allows for extremely precise intake/
exhaust timing and very high scavenging efficiency resulting in
higher output
IG-02 electronic ignition system can be powered by 4-6 cell NiCd/
NiMH batteries or 2-cell LiPo batteries
Custom designed Walbro carburetor mounted to rear of engine with
integrated choke rod guide
Two year limited warranty through Hobby Services beginning at date
of purchase

If using a different brand of oil other than Klotz, OS recommends
their own mix ratio which may differ from the manufacturers' For 40:1, and 50:1 oils, OS recommends a 30:1 gas/oil mixture 25:1 is 5oz of pre-mixed 2-cycle oil or 151 ml per gallon of fuel 30:1 is 4.3oz of pre-mixed 2-cycle oil or 126 ml per gallon of fuel 40:1 is 3.2oz of pre-mix 2-cycle oil or 95 ml per gallon of fuel 50:1 is 2.6oz of pre-mix 2-cycle oil or 76 mll per gallon of fuel